Symbiosis between grain boundary sliding and slip creep to obtain high-strain-rate superplasticity in aluminum alloys

Valle, Jorge F. del; Pérez‐Prado, M.T.; Ruano, Oscar Antonio

doi:10.1016/j.jeurceramsoc.2007.02.185

Cited by 19 publications

(6 citation statements)

References 30 publications

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“…In addition, significant texture randomization has taken place during the tensile tests. The decrease in the texture intensity during superplastic deformation is consistent, and again corroborates, the operation of GBS mechanism that implies multiple grain rotation [33].…”

Section: Discussionsupporting

confidence: 79%

High strain rate superplasticity at intermediate temperatures of the Al 7075 alloy severely processed by equal channel angular pressing

Cepeda-Jiménez¹,

García-Infanta²,

Ruano³

et al. 2011

Journal of Alloys and Compounds

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a b s t r a c tThe mechanical properties of an overaged Al 7075-O alloy processed by ECAP were examined by tensile tests at intermediate-high temperatures ranging from 250 to 400 • C and strain rates from 10 −5 to 10 −1 s −1 . The influence of the number of ECAP passes on the ductility enhancement was evaluated. Elongation to failure, e F , significantly increased with increasing the number of ECAP passes up to 8 at 130 • C. The alloy processed under these conditions exhibited a maximum value of 322% at 300 • C and an initial strain rate of 10 −3 s −1 . High strain rate, e F = 210%, at a strain rate as high as 10 −2 s −1 . The large elongations together with lower stresses and lower stress exponents than those for the start material confirm that grain boundary sliding (GBS) is the operative deformation mechanism. A loss of superplastic behaviour at temperatures above 350 • C is related to abnormal grain growth and a change of deformation mechanism.

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Section: Discussionsupporting

confidence: 79%

High strain rate superplasticity at intermediate temperatures of the Al 7075 alloy severely processed by equal channel angular pressing

Cepeda-Jiménez¹,

García-Infanta²,

Ruano³

et al. 2011

Journal of Alloys and Compounds

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“…The reduction in texture intensity and the evidence of fairly equiaxed grains after tensile testing, without visible elongation along the tensile axis (Fig. 5b), is indicative of a GBS mechanism which implies multiple grain rotation [40] and absence of dislocation movement that would involve a reinforcement of certain texture components [41,42]. In addition, as demonstrated previously and is usual in superplasticity, grain growth occurs during deformation within the gauge length [43], and justifies the observed n ap values higher than 2.…”

Section: Resultsmentioning

confidence: 97%

Achieving microstructures prone to superplastic deformation in an Al–Zn–Mg–Cu alloy by equal channel angular pressing

Cepeda-Jiménez¹,

García-Infanta²,

Ruano³

et al. 2013

Journal of Alloys and Compounds

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“…Moreover, in a later paper from the same group [12] for the same alloy, significant slip was ruled out and diffusion creep was regarded as the rate controlling mechanism [12]. del Valle et al [10] have pointed out that this model cannot predict the strain rate sensitivities measured. These authors [10] favour grain boundary sliding because of the retention of an equi-axed grain shape even after extreme elongations.…”

Section: Discussionmentioning

confidence: 99%

“…There is overwhelming agreement based on detailed texture analysis that in aluminum alloys grain boundary sliding (GBS) controls optimal superplastic deformation and the texture intensity is reduced progressively with strain by the accompanying grain rotation [1,[8][9][10]. But, there is a discordant note [11][12].…”

Section: Introductionmentioning

confidence: 99%

Texture Analysis for Determining the Rate Controlling Process in the Transient and Steady State Regions of Superplastic Flow

Padmanabhan

Sankaran

Sarma

et al. 2011

MSF

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Even anisotropic superplastic flow, which is a result of an elongated grain shape and texture, can lead to extreme elongations to fracture (superplasticity). Therefore, to identify the mechanisms of deformation present during superplastic flow alone, the effects of the microstructure should be eliminated first. Using an Al 5083 alloy, in which an equi-axed microstructure is present from the beginning, it is shown that grain boundary sliding, accompanied by grain rotations, is the rate controlling mechanism.

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Symbiosis between grain boundary sliding and slip creep to obtain high-strain-rate superplasticity in aluminum alloys

Cited by 19 publications

References 30 publications

High strain rate superplasticity at intermediate temperatures of the Al 7075 alloy severely processed by equal channel angular pressing

High strain rate superplasticity at intermediate temperatures of the Al 7075 alloy severely processed by equal channel angular pressing

Achieving microstructures prone to superplastic deformation in an Al–Zn–Mg–Cu alloy by equal channel angular pressing

Texture Analysis for Determining the Rate Controlling Process in the Transient and Steady State Regions of Superplastic Flow

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